Multiple instructions including branch instructions are grouped into a condensed variable length instruction. A trimmed and grouped branch instruction branches to one of the instructions in the same group. Therefore, a grouped instruction including branch(es) inherently executes correct branch behaviors without deploying any branch prediction schemes. In addition, a grouped instruction in a condensed form delivers multiple operations to execute without fetching all of the instructions grouped separately from the instruction memory via its caches while conserving instruction memory and/or cache as well as decreasing the number of bit switching on the bus. Software developers can make their own compatible, compact and ciphered instruction sets after grouping existing instructions in their software compiled with existing software compilers and the associated microprocessors.